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What if Blue wasn't even a jerk? Think about it. If you go into his house before getting your Pokémon, you can't get the Town Map from his sister. Then after he says "I'll tell her not to give you one!", you can get it. What if he went home and was like, "Hey sis, go ahead and give Red a map, okay? Gramps gave us an errand."
Then on Nugget Bridge, he tells you to check around in the grass, which is where you find Oddish/Bellsprout to help with Misty, and gives you the hint to check out Bill's PC to help complete your Pokédex, even though he's competing against you to complete it faster.
At Lavender Tower, the first thing he did was check your Pokémon to make sure they weren't dead.
Right before the league, he tests you to make sure you can handle it.
So sure, he didn't help Bill with his issue, or make sure the Captain on the S.S. Anne was okay. He didn't care about them. But you were his best friend, and he wanted to help you out, even though he had to keep his tough exterior going. He's basically like a tsundere best friend.