Plenty of knee-jerk responses, nobody asking further questions.
Have you been with the band long? How have relationships in the band been up to now? How many gigs have you done together? Do you enjoy playing with them? Had the "replacement bass player" remark not been made, would you have liked to carry on with the remainder and try to recruit another guitarist? Was it poorly expressed (ie. they meant dep rather than permanent replacement), in which case, are you being overly sensitive?