You are experiencing "hetero-normalization irritation". This occurs when a person of intellect and/or life experience encounters the hetero-normalization of gay men in media. The person is aware that gay men are not women. They do not think, act or conduct themselves within a relationship like women. The person then becomes irritated upon seeing this. In this case, just as women are sluts for sleeping around and men are studs, the same ideals are applied to the hetero-normalized uke. Hetero-normalization is rampant in yaoi and BL because most are written by hetero women for a hetero female audience. The theory is that women can't relate to a gay man unless he acts, thinks and conducts himself in a relationship like a woman. Most would think this idea is BS until one reads the scathing comments by hetero female readers for manga like "Prince Charming" where gay men are depicted realistically. Sadly, it is true that a hetero will never understand the feelings and actions of a homosexual person. They exist in two separate and distinct worlds that mingle and overlap, but never blend or intertwine. I can only assume that your irritation comes from knowing the truth about LGBT+ feelings and action, whether first or second hand. Yes? This makes it hard to view gay men as women or any LGBT+ person as anything they are not. You are among the minority, but the majority's ideas are not always correct. You already understand the truth, don't let anyone deceive you.
I hate hate hate the double standards in yaoi mangas where an uke who has a lot of sex is somehow bad but a seme who does isn't. On stories where ukes have lots of sex there are tons of comments like "I hate slutty uke", but there's none like that here where there is a super slutty seme. Also in the story Kusama even called the other boy he was shown to have sex with slutty, even though he himself is probably sluttier than that uke! It annoyed me so much I almost stopped reading right there. This is one aspect of the Japanese, of yaoi mangas, and of double standards between uke and seme and both genders in general, that I despise. (︶︿︶)=凸