Context: Shuri Kojuurou 朱里小十郎, a boy that looks like a girl, i.e. a "trap," or otokonoko 男の娘, compliments Makabe Masamune 真壁政宗 for being intelligent, humble, and kind, to which Makabe responds:
omae datte "sou-uke no Kojuurou-kyun" toka iwarete ichibu no joshi ni daininki rashii zo? お前だって「総受けの小十郎きゅん」とか言われて一部の女子にだ大人気らしいぞ [I] hear you, too, are called [stuff like] "the total bottom Kojuurou-kyun" and are very popular with one portion of the girls?
In the sense of him being popular, too, with girls, like Masamune, except Masamune is popular for being a "hot guy," ikemen イケメン, while Kojuurou is popular only some girls (the fujoshi) for being an otokonoko.
sou-uke - a type of uke 受け, the "bottom" in a fictional homosexual relationship, which is always the bottom no matter what character he's paired with.
kyaa きゃーー *fangirling noises*
oseji janai tte お世辞じゃないって [I'm telling] [you] [it] isn't flattery. (i.e. Kojuurou really means the stuff he said about Masamune, they weren't insincere or joke compliments.)
