You have every right to do that, and that’s not a problem here.
If that's the case why do you keep crying here?
I don't consider it professional
It's your personal business what you consider, you should keep it for yourself and restrain yourself from trashing my thread with non-business related things.
that after a few trades we had of a total value of about $2000 you refuse my offers with the excuse that $100 or $200 is too small for you - and at the same time you trade such amounts with other members.
I can refuse a trade at my own discretion, I am not obliged to trade with you and I don't owe you anything, so stop acting like it.
Then again:
Do I have a right to refuse to trade or I do not, according to you mister?
You have every right to do that, and that’s not a problem here.