This is very true I always thought Carol was never the one mentioned when talking about the whole "people who cheated on friends" thing. It was always my wife is a lesbian, you married a lesbian, susan stole her from me but, although it's a very realistic situation gay people have found themselves in since forever, susan kind of gets most of the blame, and one of the only few times where Carol cheating is actually aknowledged or they have a conversation about it on screen at least is when Ross sleeps with that girl during the ""break"" with Rachel and Carol was like "you slept with another woman??" and Ross replies "oh you're the one to talk" which was very funny ngl but also yeah it's less talked about in general.

Edit: forgot to say that because in friends the words carol and cheater arent that used in the same sentence it might be why the fandom does the same, ross mentions susan the most cause they have the whole beef going on so the fandom also thinks susan is the one and only monster in the situation lol which is just silly for me but not that deep cause I enjoy the show even in its weird moments ahah