cantankerous

A cantankerous person is someone who is grumpy and unpleasant to be around. They often complain or argue with others.

You might hear people use this word when describing someone they know who's always grumbling about something, like a neighbor who complains constantly about noise levels or a friend who always argues with the waiter at a restaurant. It's not that cantankerous people are mean-spirited; it's just that they have strong opinions and don't take well to opposing views. If someone calls you cantankerous, it might be because you're being stubborn or refusing to listen to others' perspectives.