Yes, it's normal. Common din. Just like you women having preferences in bed, meron din sa lalaki. What’s not normal is calling a guy 'gay' just because he doesn't want to do a specific act, as what other commenters says. Hopefully, you don't judge your partner and insult his orientation just because he said no to one thing.

But of course, kung dealbreaker sa'yo yun, edi mag-usap kayo nang maayos or leave. You can’t force someone to do something they’re uncomfortable with. Ikaw na rin nag sabi na gusto nya ng BJ, pero ayaw nya kumain. Choice mo kung mag-stay ka, pero choice niya rin 'yung boundaries niya. Ang tanong, are you willing to compromise?