Kushal - He was given a warning because he climbed BB house and tried to escape (which is obviously not allowed)
Tanisha - She was given a warning because she pushed Kushal numerous times.
In this case, with one warning looming on his head, Kushal goes and hits Andy. So Big Boss tells him to get out. Simple. Theres nothing about it being biased. For those saying Andy deserved it, noone deserves any kind of physical attack, I personally think he should be given a warning for his role in this whole fiasco.