My husband likes oral sex. I have heard that it is makruh. Do I have the right to refuse him (on this point)?

All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.

Your husband has no right to force you to do that. Therefore, if you follow the opinion of those scholars who forbid it, then it is obligatory on you to refuse doing so. If you follow the opinion of those scholars who believe that it is dislikable, then it is dislikable for you to agree with him on this.

Allah knows best.