Remain was nowhere near as dishonest as Leave, especially if you look at what the Electoral Commission said. Not to mention the two contradictory Leave campaigns.
I don't know who was saying it? I think everyone can agree (even the courts) that Leave campaigning was far more underhanded both in terms of veracity and in terms of legality.
> they're saying that Remain was worse
Worse in terms of less effective and less emotionally appealing, yes. Again that is fairly universally acknowledged.