of course it will be different. and you will be one day less new and more experienced. it is all part of the game - dump on the new guy - makes em feel better about their own insecurities. easy to say - but don't take it personally. it could be Jesus Christ and they'd still do the same!
take the supervisor's word for it. if he's OK with what got done - that is good enuf. you are part of the equation whether you feel like it or not.
hang in there - it does get better. just remember how it feels when the next new guy comes along. treat him the way you wish they had treated you - and you may make a friend for life!
"That you are here - that life exists, and identity; that the powerful play goes on and you may contribute a verse. . . What will your verse be?" Robin Williams as John Keating in "Dead Poets Society"