I think that's a bit harsh and just excusing one person's behaviour as he is a bit more successful. I don't see Jason as any harsher at all - just lacks the wit of Craig.
Well, he probably is a nice enough chap, but as you say, he doesn't have the wit of Craig, so he comes across as a bit unpleasant.
I know it's a weird connection but it reminds me a bit of what Stewart Lee said about Frankie Boyle, he said he could see why people could think he was a bully because he appeared on stage on Live at the Appalling in an expensive suit with dry ice all over the place. Stew said that if you were doing comedy like that you really needed to have a persona of failure and make yourself look just as bad, so people could see it was a character.
It's like that with Craig, he makes the comments but then he'll participate in some silly joke, or he'll always be the first to get on stage and have a dance himself, and the audience know it's all a bit of fun. Whereas Jason Gardiner doesn't really do that.