Covid 19 complaint

Security stop me because I was wearing a mouth shield not a face shield but a mouth shield that was made from medical use but they said it is not allowed and I went in the other security came and did not keep his distance and kept saying that that mask is not allowed. Kept invading my space .I have been in that builders 3 times with that same mouth shield. No problem but today they kept invading my space I don't like going there they are over priced on all there products and unhelpful. When does a mouth shield give any one the right to forget distance there was no other customers. What is more important the type of mask or the social distance between us. Or can you decide which work for you?