I think your annotated exception and interpretation of this phrase is something of an overcorrection here. Leaving aside how the author may feel about his own h

I think your annotated exception and interpretation of this phrase is something of an overcorrection here. Leaving aside how the author may feel about his own hobby and what justification you have for speculation on the point, the word "weird" is a versatile one and could very easily be a way of saying "uncommon" or "highly specific." "I don't think retro computing is a weird hobby" would seem to say all you want to say, but in a sympathetic and positive way that doesn't turn things around on the author.