Is it illegal to have my handgun in my waistband while working on my truck in front of my house in Jersey City New Jersey at night for protection?

Last night I was fixing the brakes on my truck in front of my house Around midnight because it's hard to do during the day with my kids. About an hour into working on my Van about 12 Police officers were surrounding my Van One of which drew his weapon as he asked me to show My hands. I think he should have had his gun drawn already also form in case of accidental fire thinking I am going for my weapon even if I'm not out of fear Rather than already have the weapon in his hand and know he has the advantage if I did reach. Besides that point After I prove my weapon is mine and I have a purchasing permit and on my own property or in front of my property does he actually have the right to tell me I'm not allowed to ever do that. Force me to let them in my home to make sure I have a safe and force me to put my weapon away.