Firstly, it's just for fun. Nothing malicious about it.
And secondly, it's ironic you reacted this way when you and some others were poking fun at the way Chilwell speaks the other day because he hangs out with Drinkwater...
Why would it hurt him? Lampard has also praised Mount a lot last season. Hardly anything new to see the manager praising new signings. If Mount is hurt by this, then he is a softie.
Worth noting that Giroud said this about competing for places only a few days ago...
https://www.goal.com/en/news/werner-isnt-the-same-as-me-giroud-relishing-chelsea/utyua7c2isjwzoinkuhjgyt1