Even though my boyfriend disagrees, there's something that I'm going to take part in.
What makes you think that he disagrees?
He clearly told me so.
You do not always have to agree with your partner on everything. But you should also know that if he feels really strongly about this, it may affect your relationship.
What do you mean?
I mean that it's not necessary for partners to always agree with each other, but sometimes people react negatively if you disagree with them on things that they feel passionately about. If this thing is an example of that then if might cause a rift in your relationship with him.