I'll echo jimimc and others in the sentiment that there's no such thing as minor rules infractions. An infraction is an infraction, and they should be called when they occur. If the OP is stepping on his mini, even just barely, it should be called, no question. The OP should have no beef with the fact that he was committing a violation.
But from the description of the incidents, the guy calling the OP on his violations is, in a lot of ways, worse than the folks who say "who cares" regarding any and all rules stuff. He really deserves no credit for making the calls he did, not because he's a hypocrite who was stepping on his own mini, but because he couldn't make the calls correctly and in accordance to the rule book. It's guys like him doing things like this that make the people that truly know, follow, and call rules properly look bad. Guys like him that perpetuate the stereotype that people who call rules are jerks just trying to mess with other players. Guys like that guy piss me off like no one else in the game.
But from the description of the incidents, the guy calling the OP on his violations is, in a lot of ways, worse than the folks who say "who cares" regarding any and all rules stuff. He really deserves no credit for making the calls he did, not because he's a hypocrite who was stepping on his own mini, but because he couldn't make the calls correctly and in accordance to the rule book. It's guys like him doing things like this that make the people that truly know, follow, and call rules properly look bad. Guys like him that perpetuate the stereotype that people who call rules are jerks just trying to mess with other players. Guys like that guy piss me off like no one else in the game.