Caucasian parent here. After having S20 graduate and S21 being a senior at a public school I would say probably not racism. I was thinking “squeeky wheel”. I’ve had to “push” several times to get my kids into programs or tested. Sometimes it’s a numbers game. Sometimes it’s a teacher playing favorites. Sometimes it was someone not doing their job. Sometimes it was my kids not knowing or communicating or self advocating.
Not saying racism doesn’t exist but please have some solid proof if you want to go that route. You can really do some damage to someone’s reputation and career in today’s environment.