There's no reason to try any harder than this. Most people who will see this tweet won't look at the handle or the replies - they're read the tweet, then move on. And if they see enough of these tweets, they may just internalize the notion that unions aren't worth it. It's better for Amazon to make more tweets than it is for them to make better tweets. And it's not like they're going to see any repercussions for trying to maliciously influence their employees.