Bluetooth is also on 2.4g. It is lower power and lower data rate and managed better than wifi, so it causes less problem, but I would range test the RC in low power mode, with Bluetooth on/connected, with Bluetooth on/disconnected, and with Bluetooth powered off to see if there is a difference in range. This is especially true with older / less expensive RC rigs and maybe more an issue with the newer more powerful Bluetooth.
When Bluetooth is disconnected due to range, I suspect that it's data rate drops even further, making it even less of an issue.