[sockmonkey]

So, why don’t people like yellow jackets? Don’t they kill mosquitoes, caterpillars, flies, and other pests?

[aMorePerfectUnion]

“So, why don’t people like yellow jackets?”

They sting if you get too close to their hive.
They become very aggressive seeking food as fall comes.
They sting.

[Billthedrill]

So, why don’t people like yellow jackets?

They're aggressive, for one thing, and they don't pollinate. For another, they'll wipe out a honey-bee hive in the matter of a couple of hours.

[trisham]

I can’t go outside for five minutes without one or more aggressively pursuing me, and trying to sting me. It’s very painful.

[Bigg Red]

They are nasty little punks. The husband and I were sitting outside once in the fall, and one landed on his arm and stung him immediately. He had not made any sort of movement after the landing, either.

One went down my shirt and stung me in the chest while I was in my laundry room. Hurt for about 2 weeks.