I know what your going thru,when I tell people I grew up in tennesse they automatically think I'm into fishing and nascar and all the other redneck nonsense,they freak out when I tell them I read books and spend all my spare time on the internet educating myself.
I just spent the last year working for one of the worst places in town,they didn't fire me I fired them.When I stared working there they gave me a 90 day probationary period ,I gave them a years probation and they failed.
If you get a chance read my where's the opportunity thread .Be careful about rubbing people the wrong way, part of being a good employee is being a good actor,sometimes it's best to just pretent to laugh at there dumb jokes and just play along.
Always remember the only one looking out for you,is you.
They said you were slow ,well do they want the job done in a hurry or done right.