Hello! I have a question about psychological chess. In multiple situations.
When I play chess otb and play blitz against someone weaker than me, should I press the clock more fast or should I press it slower and calm?
And what should I do when my opponent is equal or stronger than me? What is psychologically the better option to make my opponent uncomfortable?
And same question when the time control is Rapid? And with classical?
Thank you in advance for your answer!
You should press the clock quickly, but quietly. This lures your opponent into a slower tempo, thus using more of their time. It does not matter what their rating is. If you're talking about general chess playing, I don't think you should change how you play too drastically, no matter what rating.
You're strongest when you're most comfortable. Why do something different? Time control does not matter.
There are players I know who press the clock very slowly 
Mr Ross, what is it that 1d4 players hate the most facing? Of course the answer can’t be universal, but hopefully you will be able to give me an approximate answer.
Of the options I gave, I think two knights tango is the most rare. It often gives you a really active position (though strong masters will force me to play a cramped position in it). There's also some nice opening trap in the two knights tango. I would think people rated 2000 and below on chess.com won't know how to respond against it.