While that stereotype may be true for some developers, I don't find it holds for most devs I know and work with. People incapable of dealing with emotion probably don't make great employees to begin with.
The emotional response is probably the most egregious that a developer can do, but I stand by my assertion that developers aren't trained in communications. I work with some developers who write amazing code, but if you read their emails, you'd think they were written by a ten year-old. The responses are terse, lack proper punctuation, and usually rife with misspellings. And that's fine: their job is to write code, after all. But it doesn't look good if that raw response goes out to the customer.
At one of the companies I've worked for, the tech team can be directed a ticket or whatever to look at, but they respond to the customer service team, not the customer.