There is the F where the pitcher just got drilled by a 100 mph line drive off the shin.
There is the F as you run down the line because you popped out.
There is the F you ump.
All different and different umps have different tolerances.
If you do any of the above you could get thrown out and if you do you should just walk off the field and accept the ejection. If you don't, you got lucky, carry on.
Also lately there is an emphasis on thrown equipment intentional or not.
We had an incident where a player couldn't get his bat unstuck from his batting glove and the bat went high in the air into the field of play and he was ejected. It did not look intentional but it still happened. Accept the ejection and move on.
I was standing at the fence when another player threw his bat at the bucket after making an out and nearly hit his teammate in the head. It was hard enough it could have knocked a few teeth out.
I was standing along the fence when one player grabbed the top of the fence in anger and shook it until it almost came apart.
I watched another player egg on an umpire trying to get the umpire to punch him and then said F you to his face while pointing his finger in the umps face.
Unsportsmanlike conduct is going to continue to be punished. If you got away with it in the past count yourself lucky.