Should I feel sorry for sending my friend a meme?
Why would you make a friend feel bad with a meme?
He was being a dick to me.
You shouldn't upset a friend intentionally with memes. You'll end up hurting their feelings and angering them. If you don't apologize, they may no longer want to be your friend anymore.
Aw he just needs to get over it. It was funny.
He might not think it is funny, you should support him. Maybe if you apologized he can get over it faster. Maybe be more considerate next time?