This is nothing. He's a young guy who believes he's worthy of the spot. Would you rather he say, "I would really like a professional like Earl Thomas to come in and show me how to be better." ?
Stay hungry, young man...and takes those feelings of disrespect and use them as fuel.
I would imagine that Richard probably has given X a vote of confidence and that probably has a lot to do with Dallas going 0-fer on signing a safety. I don't really agree with that, but X likely sees Dallas fans pining for Earl and is taking it as a slap.
The thing that sucks, though, is that all these young guys who we'd like to see "stay hungry" are seeing how the team is playing Lawrence, who most would agree has been an example of how you want your young players to approach the game.