Parents do need to stay away from practice as best they can. Your kids need some time away from your critical eye. When my kids were younger high school players I picked them up after practice. If practice was still going on I walked near the field.
Being a travel coach the high school coaches would engage me in conversation. It was general baseball/softball conversation. I wouldn't talk about my kids or other players. My kids asked me to stay in the car and wait. Rumors had started I was working the coaches. My daughter started as a freshman. My son was the first soph opening day starter six years. It wasn't about talent to some parents. They believed I was manipulating the situation.