I'm not going to let shorter people in front of me at a concert.
Why won't you let them in front of you?
Because I hate people and it makes me feel good to lord over them.
It feels really good to feel like you're superior to others, but you shouldn't do this at others expense. Putting others down to make yourself feel better makes you a smaller person. Be kind and humble towards others, and you'll be more respected.
Hey man, I work out and I'm strong. I'm allowed to feel good about myself  by being a jerk.
Working out and being strong isn't a proper justification for treating others poorly. You're not entitled to a bad attitude just because you feel you "earned" your right to it. If you treat people this way they may return the favor.