I've noticed this is a typical reply on social media platforms. I always thought this is a standard polite response until I encountered this entry on Urban Dictionary:
thanks for reaching out
The most obnoxious possible reply to someone who has contacted you, often used in professional settings.
Hi John, thanks for reaching out. I'm quite busy right now on many important projects. Why don't you reach out to me again at this time next year and see if I have a couple of free minutes then. Or, better yet, how about never? Does never work for you?
Is it true? What does it really mean? Is the Urban Dictionary definition a joke?