Trump was talking literally about directing the military to shoot looters (it's right there in the tweet!), not expressing an abstract right of people to defend their own property.
So no, downvoting you isn't anything to do with the constitution.
> ....These THUGS are dishonoring the memory of George Floyd, and I won't let that happen. Just spoke to Governor Tim Walz and told him that the Military is with him all the way. Any difficulty and we will assume control but, when the looting starts, the shooting starts. Thank you!