A while ago I was in a deep BR run, and I played a free swinging guy who fit the profile you just described. I struck his Mondesi out with an offspeed pitch, since he was sitting heat all the way, and of course he reached 1st on a passed ball.
Then the game within the game started. I was already annoyed that he reached on a K, and knew he was stealing at some point. So he took a step every single time and I threw it over to 1st every single time. Then he messaged me all angry saying "PITCH THE BALL SMH", which I replied to with saying "yeah I will once you stop taking that step". I'm not lying, this sequence continued for about 15 minutes before my pitcher decided to throw it behind the 1B on the 1000th pickoff move, giving him second base.
Either way my point is this:
The guy takes an extra step, I react to that by not pitching the ball but attempt a pickoff move. After this keeps going, he gets angry with me, as if I'm the toxic player in this situation? So basically he wants me to just give up second base to him. I get really annoyed with people like this.
Sure, I won't do this every single time someone takes a lead. But if I notice you're one of those guys, I most definitely will. Want me to stop throwing over? Stop taking an extra step and stop blaming me. It's that simple.