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Even if you were the Charlie Brown Snoopy and Woodstock Redskins shirt, unless you went everywhere with a name badge everyone you meet would assume you are less smart than you really are – no one assumes they’re talking to the smartest man in the world – statistically you’d assume a random stranger is average. To be polite and charitable you show you consider them above average. In the workplace this politeness is often overshadowed by the need to make sure actions are taken and instructions followed, so may appear condescending.
Charlie Brown Snoopy and Woodstock Redskins shirt, hoodie, sweater and v-neck t-shirt
Best Charlie Brown Snoopy and Woodstock Redskins shirt
The source of offence here appears to comes from the slight on your Charlie Brown Snoopy and Woodstock Redskins shirt. Flip this and be thankful that you are smarter than what the average person assumes. If the other person is actually a relative dunce, consider that the info they gave you is complex for them and that their lived experience may include the need to have instructions repeated to them over and over again. So be patient and thankful.