I switched sides a couple of times last camp. Never expected any hello's and wasn't disappointed. I mean why should they.
Addendum: I pondered on this a bit. I wonder if they felt you came over for the cheap perk rides instead of your stated goal to help. Could certainly appear that way.
It also got me to thinking about another factor in game play. Many bish, if not most, don't really care if the perk rides increase fairly high. Although they do when it's 29 eny. The reason being is they enjoy capturing bases. Ironically, the ENY feeds the idea of base capturing. Let's say you're a furballer. Now if the enemy is now flying cheap perk planes and you can't up your favorite 15 eny plane (FU-1a here) what do you do. Well you join missions with A8s, and other big cannon planes (forget the eny of the 110). Safety in numbers thingy. I mean why would you want to get b and z'd to death by 3 cheap tempests.