YOU are responsible for YOU (and your kids and family)
Keep it concealed, part of that is the 'element of suprise', annoucing every time you enter a new building that you are carrying is unwise and unecessary IMHO.
You are taking care of your business, why should they mind? No different than kissing your wife at their house, displining your child, taking your medication, or anything else that is your business.
Now, they do reserve the right to tell you their opinion of your choice, even ask you not to do it. That's fine, you don't have to listen. They can ask you to leave, and you are morally and legally required to do so IMHO.
I remember once family A invited family B, C, and mine over, a family oriented home cooked pizza party because they all had girls of the same age, 2 had boys 1 year younger (me and another) 1 had a boy 3 years younger, and some little kids
Well, Family B had a child who wasn't in kindergarden yet, but started t he next year. and he misbehaived by throwing some food, tryign to get attention, yadda yadda. His mom verbally disiplined him. He did it again, and his mom took him aside out of the area and gave him a little swat on his behind. Family A saw this. They said something to the effect of 'we don't believe in spanking' to which B replied something to the effect of 'that's your choice, we believe in a controlled and reasonable spanking, different parenting styles' Family A then clarified with basically 'You misunderstood, we do not allow spanking of children in this house' At this point my father interviened by standing up and saying basically 'thanks for having us over, we'll return the favor soon, but we need to get going'. The host was suprised, it was basically the middle of the pizza party and enquired, to which my father replied basically 'I believe in spanking my kids too, I don't want them to get any ideas in thier heads about what they can get away with in this 'spank free zone' and while I respect your deicion, i don't feel bound by it, so my family and I had better leave before my kids need to learn that your 'spank free home' rule doesn't apply to me and how I choose to dipline my kids.' So we got herded out, and family B was getting into their car as we pulled out. Later I fouind out that family C (thier boy was enough younger that we would play together when our sisters were the cause of us being together, but didn't seek eachother out) left soon after too.
Respect the laws of the mans house, but no need to go into a long discussion about each and every rule. Assume he is reasoanble, and his rules are reasonable. If you find youself in conflict with one of his rules, you must decide if you wish to comply, or depart.