What’s with the title of this thread? Neither the OP or subsequent posts are a general conversation. This has all been specific to Ivanka.
To be general: the point that’s been made that questioning a ger might be lashon hara while not questioning an invalid ger has no consequences is totally absurd. The entire nation having a twisted and incorrect definition of Orthodoxy thanks to one high-profile person is much more destructive than the minute possibility that that person will find their way to the CR and be offended.
It doesn’t have to be high-profile even. Even if there’s a fake ger in some small community, within that community they’re making a chillul hashem. And, they’re damaging the integrity of gerim, which nobody ever seems to care about other than real gerim.