HTML codes in post title & a Twitter button

I’m creating a blog where I’ll be using <em> codes in post titles extensively. All seems well, there are no ugly codes in the RSS feed or when it’s liked and shows up on a Facebook wall.

But when I tweet a post with the official Twitter button, <em>ITALICIZED POST</em> shows up. So my question is this, perhaps I didn’t search enough, is there a tweet plugin that can recognize not to include those tags? Or perhaps an SEO plugin that will change that?

Or maybe there’s a way for me, myself, to modify it in coding. Any help would be greatly appreciated!

EDIT:
The ugly coding doesn’t even show when I use the code tag for this post, it’s the official code for < and > arrows replacing those respective actual arrows.