It crosses the line as soon as someone "upbadges" their car

M badge on a 528
4.8is badge on a 3.0
AMG badge on a C230
Lumma badge on a piecemeal kit

I don't openly ridicule people for their preferences but as soon as they start posing in this way all bets are off.

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12 X5 M - 06 X5 4.8iS - 03 X5 4.4i - 03 M5 - 02 X5 4.6is - 99 M3 Dinan S3 - 98 M3 - 92 850i-6 - 92 850i - 91 325ix - 89 M3 2.5 - and a few parts cars