I remember this one time Thor gave Tony a magic gemstone because Tony was like "hey Thor, Asgardian stuff is pretty great, bet I could use it to help humanity!" and Thor was like "yea, verily, I doth trust thee with yon magic gem, and I trust thine intentions to be pure!" to which Tony replied, "oh, yeah, totally. I'm gonna use it to make like clean, renewable energy so that we can stop using fossil fuels and other environmentally damaging energy sources."
And then, later on, Thor went to this Eastern European country where the tyrannical regime was about to commit genocide on an ethnic minority. And you know what Thor did? He stopped that. He stood there with his hammer and told these dudes with tanks and guns who wanted to perform a massacre and ethnic cleansing, "I say to thee nay."
Then! Then! Tony Stark rolls on up in his Iron Man armor and is like "look, Thor, you can't get involved here. I'm here at the request of the US state department, and we want you to back off."
And Thor replied to the effect of "trollop, art thou serious? Thou demandst the god of thunder stand by and knowingly allow innocents to come to harm?"
Tony doesn't answer except to say, "okay man, this is me asking nice. I only do it once. You had your shot." And then he flies off.
To meet Dr. Doom!
And Doom is like "yo dawg remember that one time I stole the Silver Surfer's powers and used them against him? That was some tight mad science supervillainy, fo rizzle!"
And Tony was like, "yeah, that was pretty tight!" And goes back to Stark Industries. While he's at Stark Industries, he builds himself a new set of armour! A THORBUSTER set of armour, designed only to take out Thor!
(for those watching at home, Thor is a super hero who has fought - to his own detriment - to save the Earth numerous times and genuine believes Tony Stark is his friend)
Now, this armour has two notable features: inspired by Dr. Doom! it steals Thor's own powers and redirects it at Thor, and it uses a magic gemstone from Asgard as a power source.
Why, yes, gentle reader, it is the very same magic gemstone Thor gave Tony with the explicit understanding that Tony was going to make clean energy for all of Midgard.
Oh, and you better believe they fight. Tony gets the better of Thor for a while, since Thor is holding back and doesn't want to hurt his friend (remember, Thor + Tony = Friends is what Thor Actually Believes). Eventually Captain America shows up and intervenes so they stop fighting, and Dr. Doom! marches in his troops to annex the territory. The US state department orders Tony and Cap out, so they go.
But not before they both say to Thor, "we're very disappointed in you, man. What did you think you were doing, protecting this innocent ethnic minority from being slaughtered?!" to which Thor looks at them with sad, uncomprehending puppy dog eyes. He genuinely does not understand why these two great heroes are browbeating them. It ends with Cap and Tony going "we're not friends anymore, Thor. We don't even know you anymore."
This is during a storyline where Thor would go on to rule Earth. In this storyline Thor managed to eliminate poverty, disease, racism, sexism, classism, religious conflict, and 99% of political conflict. In this entire storyline Thor is depicted as being the villain. Thor's utopia was bad because humans were too lazy under Thor's idyllic rule to watch their kids (Thiafli, one of Thor's friends, is convinced that Thor has done wrong because a boy drowns because his mother was too drunken to properly supervise the boy, and because there was just so much food some of it was left to rot on the vine because there were people who were just too lazy to harvest it - this comes after Thiafli [Thiafli through time travel sheenanigans went from like 2000AD to like three hundred years later] is shown like a dozen people who, in pre-Thor rulership days, would have been unable to become the master pianists, mathematicians, and scientists they worked hard to become because they would not have had the financial means under the status quo that existed before Thor).
I also remember a time when Tony got bodyswapped with one of his Soviet counterpart enemies. I think it was one of the Red Dynamos. While in the guy's body, Tony committed acts of treason against the USSR and maimed a guy. Seriously, Tony ripped a dude's hands off. The guy had black comic book blood coming from his stumps. It's not explicitly mentioned in that issue what happens to the guy Tony swapped bodies with - the issue ends with Tony and him switching back and the Dynamo guy getting arrested by Russian authorities. But honestly, the guy who lost his hands probably bled out and died and the Red Dynamo guy probably got death or the rest of his life in a gulag in Siberia.
I can forgive him for his Illuminati stuff. It's always laudable to try and get rid of the Hulk.