It's not the number of people— for me, at least. [ How to explain... ] There are people you meet as strangers that don't take things seriously, so it's okay butt heads. Then they start caring, and you have to watch your words.
[ This is where things fall apart, so Minato discounts them as people tough to hurt, because getting to know somebody means that your words have weight. ]
But then there's people you've known for years. They've survived you for so long already, that whatever you throw at them doesn't hurt anymore. That's what I would consider tough to hurt.
[ This is contingent on time, though, on keeping up a relationship and weathering all sorts of arguments, and that level of friendship isn't one Minato has experience with, especially when he would walk away from relationships that don't work instead of stubbornly pursuing them. ]
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[ This is where things fall apart, so Minato discounts them as people tough to hurt, because getting to know somebody means that your words have weight. ]
But then there's people you've known for years. They've survived you for so long already, that whatever you throw at them doesn't hurt anymore. That's what I would consider tough to hurt.
[ This is contingent on time, though, on keeping up a relationship and weathering all sorts of arguments, and that level of friendship isn't one Minato has experience with, especially when he would walk away from relationships that don't work instead of stubbornly pursuing them. ]