Sure, how about this post a long time ago, that fortunately, after some heated discussion, @arcange backed off from that position.

This is a reflection of some witness thoughts about people posting on both chains.

A lot of this attitude might not be posted on HIVE, but I have seen a lot like this both from witness and from other users across some of the community discord channels.

Or this post from a curation community, where some witness downvoted (including @themarkymark) for no apparent reason, at least none that were publicly explained, but apparently, through some discord conversation, the reason given was that @project.hope is doing his curation project both here and on Steem.

If you look deeper, there is probably a lot more examples, but sorry, not much time to search for them right now.