Can an RGB mousepad cause interference with my wireless mouse?

No, not really. The LEDs in a mousepad draw power over USB and produce light, not radio signals on 2.4GHz or Bluetooth frequencies. The rare exception is an extremely cheap, badly built mousepad with a noisy power circuit, but that’s more of a lab curiosity than a real-world issue. In practice, if your wireless mouse is stuttering, the culprit is almost always the mouse itself or your desk environment — the glowing mat is innocent.