My guess (judging from similar historical events) would be that it's a combination of:
* New administration means people (including border guards) are now feeling emboldened to act in a certain way. This means people that already had that leaning, will be unabashed in their action, and middle-manager level will be less strict on stopping these behavior since it might backfire on them.
* Now suddenly the topic is interesting to the vast cohort of the population. Which means that in the media boardroom, where they decide what to cover, put out, etc, they take that in to account and report & investigate more of it. Sometimes, things that was already endemic but unnoticed get a huge bump in coverage and create a perception that it's top-down, while in reality there have always been the issue, but now it's more blatant.
Days after the Brexit vote, people went out of their way to vandalize non British business establishment. One Polish boutique was trashed and people now felt it was "ok" to leave graffiti in the form of "get out you're not welcome here". Those sentiment was always there and if you go to any immigrant community in any country and ask locals they usually have stories about it, but with the brexit vote many felt that was justified and did it in excess, which lead to media coverage. Did leave campaign say any of that, or instructed people to do anything similar? No. But part of the follower of that campaign already had the leaning to it, and it wasn't until the comparison to Kristallnacht started to pop up until the parties took a firm stance to it.
Probably same thing happening here. So the thing to watch out for is probably what would be the official reaction to it. a silent nod might just mean this is the new norm.