Most of the examples you provided (specifically dish washing, fruit picking, house cleaning) are not traditionally considered "blue collar" or "the trades." Rather they are considered unskilled labor. So your comment doesn't really respond to the GP's comments about the trades. I suspect that relatively few would argue that unskilled labor is a great way to support a family. I also suspect that conflating unskilled labor with the trades and then using that to claim that the GP's comment was essentially racist is the likely source of the downvotes you've gotten.

Note I excluded school teaching from my earlier comments. TBH I'm not sure what category that falls under, but I'm relatively certain it's not unskilled labor.