I'm going to be rude to my friend's dad because of his past job
What kind of job did he have?
That shitty guy used to work as a guard of the prison
It's okay to have a negative opinion about a job, but you shouldn't mistreat people for doing it, especially if they are a friend's parent.  Besides, this man has obviously moved on in his life and found a more acceptable career, so you shouldn't keep judging him.
It's not like that anymore. Besides I just wanna give him a taste of what it's like so he understands.
If you are rude to him you know you might not be able to see your friend anymore right? Don't you think that he could have been on of the good guards, you might get to know him better and see a different perspective.