You'll find that people will look away from you while you're holding a conversation with them. When speaking with older people, remember the importance of respect for elders. Depending on the context, it may not be appropriate to address an elder by their legal name. Follow the example of the person introducing you. When in someone's home, always take off your shoes before waking on a rug or carpeted area, or before sitting on or around a mat.
People use floor mats to serve meals on.
The exception to this rule is when they have placed a small object directly at the front of their prayer mats which allows people to pass in front of the mat. At some distance from the person who is praying, you can pass in front of them. Use your best judgement, common sense, and close observation of others to determine what that distance is. When entering a room or a new situation, be sure to shake everyone's hand, even the youngest child. A visit from someone is regarded as a gift.