https://en.wikipedia.org/wiki/Toad_worship_(Chinese_internet...
searching "膜蛤" on baidu.com yields zero results.
In China, Toad King Warship (膜蛤文化) is very popular in some people, espcially young ones. There are tones of memes and internet jokes around that and obviously nobody gets into trouble because of it.
I don't know why your interviewer told you he was afraid. A wild guess is that he was one of those young people who loves Toad King Warship, and your ice frog reminded him of it. But it's hard to explain it to a foreigner (or he find it inappropriate to mention in an interview. it's a sub-culture anyway). So he just say he cannot say about it. As you further asked for reason, he gives you the answer you have in mind, by acting as victim of surveillance state (another culture thing).
Take your interpretation for example, am I mistaken to conclude that you believe all who post that frog are both misogynist and racist, or did I guess wrong? If so, could you clarify?
It's interesting how on the internet those in positions of power get described as the real victims.
The closest person I was referring to is the player in the "Chinese esports team" that dx87 was talking about. Or possibly a hypothetical white player on who could have been put in a similar situation by an interviewer. I guess they have a little bit of power due to their position on a top team, but I don't consider that to be much power. I don't consider them victims either, just humans who have their own set of goals and fears, that I can try to analyze.
This is as asinine as getting someone to say “bomb” at airport security.
https://www.theguardian.com/world/2018/aug/07/china-bans-win...
https://en.wikipedia.org/wiki/Grass_Mud_Horse
https://en.wikipedia.org/wiki/Euphemisms_for_Internet_censor...