Maybe, maybe not. While I'll admit the retarded "STOP THE COUNT" rallying cry is sus as fuck, there's enough video, 5 sigma anomalies and other statistical improbabilities floating around that I think it's at least worth looking into a sample of these suspicious votes and following-up with the voter to confirm if they're legit.
If everything checks out, I 100% agree that Trump is being a salty loser that's just making a desperate, last-minute power grab.
However, if there is confirmed voter fraud, this is also bad for you. The democrats already weigh their primaries against populist candidates like Bernie with superdelegates. If they also commit general election voter fraud, the only presidents we'll ever have again are DNC corporate sock-puppets. I'm pretty sure you don't want that either.