I want to call our friend by a name that my boyfriend doesn't like.
Where are you going to call her that name? Is he going to be around too?
He will be present at our place.
If you have a nickname for someone that another person considers to be offensive, you shouldn't call that person that nickname. While that person might not mind, other people will and it will reflect poorly on you if you continue to use that nickname and make you look like a bully. You should be mindful of your boyfriend's thoughts on the names you give to people and try not to be offensive towards others.
I have to remember a long name and it's hard to memorize that! Even though his special name is pretty funny.
You should just call her by her normal name and try not to upset people. He doesn't like it for a reason so you should respect that.