Lowkey hate my boyfriends best friend

So I kinda dislike my boyfriends best friend..he's a guy, but I just can't stand him. It's like he goes out of his way to say or have my boyfriend do things to annoy me. I get that they've known each other a while now..like from high school days..but he's just so annoying. Also telling him what to do..and then my BF wants to drag me along..like ugh 😫😫and because I love him I'm like okay I'll go with you. He legit like ignores me when we're both around him too. What's a good subtle way to tell him that I can't stand his best friend without him flipping out on me and hating me?