Back during the D&D Next playtest, Mike Mearls openly and intentionally cracked anti-4e edition warrior jokes on a podcast. He very specifically used the phrase "shouting hands back on," which originated from edition warriors hating 4e because the Warlord could actually heal. He followed that with an extremely lame "now I'm being ridiculous," bit he was sincerely using those jokes as a reason for why the Warlord class should not exist. I don't remember which podcast it was, but it did happen.
Likewise, on one of the blog posts about D&D Next, which conveniently got deleted when WotC changed their website for the umpteenth time, another of 5e's designers openly poked fun at the very idea of liking dragonborn, as though only weirdos and crazy people could ever be into them. He ended that blog post with the oh-so-magnanimous stance of saying (more or less) that there was no accounting for taste.
Yeah. The 5e designers were more than once actively signalling "4e fans are not welcome here." They made plenty of motions as though that weren't true, sure. But nobody else got actively crapped on the way 4e fans did.
The "big tent" is a big, ahem, alternative fact.