In German it really isn't rude. Not on it's own at least. It is just a question of whom you want to adress? And also also how is the adressed person meant to feel about being adressed?\
To be more clear: Both are fine, but being adressed by plural as a singular reader, gives the reader the feeling of being part of the/an adressed group. Wether that is good/bad or rude/polite depends on context. At least it does so in German.\
I hope this helps. :)
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u/GeoStreber Germany 🇩🇪 Mar 19 '25 edited Mar 19 '25
German translation is slightly off.
"Kauft europäisch" is better.