I didn't suggest you were directing it at Robbie! I clearly stated 'the purchaser' didn't I?
Your use of a full stop brought some ambiguity to your statement, it wasn't wholly apparent whether you were suggesting it was rude to "the purchases" or someone else.
In summary - I think people who buy new cars every 12 months are idiots, and lets just leave it at that for fear of this descending into a "I'm right", "No, I'm right", "No, what he said was right" discussion.
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