The price of being nice in business is that people will take you for granted. This should not shake your core fundamentals. This is an arm-twisting technique that has existed for a long time and has been practiced by many in trade.
The sooner you realise that your niceness is seen as weakness, the sooner you will change your course of action. We live in an uncertain world with things changing rapidly across technology, work, and society: a world where everyone has an opinion. You have to stay very focused on what to take and what not to take.
People tell you that in business you have to be nice to everyone. I say otherwise. There will be people you will not like, and people who will not like you. You have to stay away from them. These are the people who will try to make you feel small. You don’t have to engage with such people or sell your soul.