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I've found a lot of quite brilliant people academically socially inept.
Its quite common especially in engineering, which is a massively Male dominated industry where old school attitudes such misogyny, casual racism let alone colourful language go unchallenged, as long as the work gets done.
Stick it on youtube suddenly your out of your comfort zone, and what good work you've done has gone down the pan.
In short, the m7/h7 refers to tolerances - implying looseness - and the schoolyard associations that go with that.
It’s all a bit vile, and apparently justified because “engineers are real people who can hack the bantz”, or something to that effect.