You seem to be missing the point that Kythia has made that the shirt, in and of itself, is not the point but rather that an environment in which such shirts are seen as acceptable may overall influence people's decision.
Whether this argument is correct or not, your summation of her argument is different from the argument that she is making which risks becoming a strawman.
1) Source or evidence that an environment where such shirts are seen as acceptable will stop women from being interested in any form of STEM subject and Matt Taylor's area of expertise in particular?
2) Let's say that there is a reputable source for the above and an environment where such a shirt is seen as being acceptable exists and does put women off being interested in studying these areas and having a career in them. Now say Matt Taylor doesn't
wear that shirt and instead wears something else. The environment still exists and women are still being put off... but would anyone be discussing it?
It's about the shirt. If he hadn't worn the shirt it wouldn't be news.
The source you cite does not establish a solid enough argument to demonstrate that wearing a beard is sexist or racist.
It doesn't have to demonstrate that something is
sexist and racist. It simply has to demonstrate that some people think
it's sexist and/or racist and thus would be put off from studying or working in an environment where such things are acceptable. I'd also note the people have long talked about the racist and sexist history of beards
and that each November articles like this
appear which say that growing a mustache "assumes privilege and a certain relation to class on behalf of the participant, which is only found in certain parts of the world" and growing a mustache in November is one of many "inherent micro-aggressions (interactions between people of different races, genders, sexualities, and cultures that represent small acts of non-physical violence) and discrimination that campaigns like Movember help perpetuate, whether directly or indirectly."
Firstly the prevalent view of contemporary Judaism is that only Jews are expected to follow the Halakha and that Gentiles are only required to follow the seven Noahide laws.
If we're using a "prevelant view" test, then is the prevalent view among women interested in STEM fields that the shirt makes them not want to continue being interested in STEM fields or have a job in them?
But more importantly people belonging to a faith in a multicultural society should not expect others who do not belong to their faith to display their signs of faith. Much as a man is not required to wear a Yarmulke to conform to Jewish cultural attire or a woman is not required to wear a Niqab to conform to certain interpretations of Islamic cultural attire.
So as part of being a multicultural society is accepting that one should not expect others to confirm to your own world view, beliefs or standards even if you find their failure to do so insulting?
Such as someone who wears a certain Aloha shirt?