How do you deal with someone who never seems to respect you?

Be your own person. Stop pretending to be someone else, don’t act to social standards this is social suicide. Thank you sir, yes mam blah blah blah, thank you this thank you that, if that’s not who you are then that’s not who you need to be, if it doesn’t feel right to your stomach then don’t do it. Your emotions is enough to display gratitude. This doesn’t mean to reveal everything about you, just be you without reveal much about yourself.
Make sure when you speak you sound loud, clear and Assertive relative to your surroundings, you don’t want to be yelling but you don’t want to be whispering either, what you don’t want is for them to tell you “say that again?” “What?’ With aggression.
Say what you mean, don’t sugar coat things, you are not a people pleaser, the moment you please people they will have you by the balls this doesn’t mean to treat them like crap, why is this effective? Because when you say things that you mean, you are showing confidence