Taken from Quran-islam.org
4- If we read 5:5, we note that God made it lawful for us to eat the food of the people of the Scripture (Jews, Christians). But as non Muslims may not utter the name of God before killing the animal, yet their food is still lawful for us (5:5), this would only prove that the utterance of God's name before slaughtering an animal is not a requirement as far as God is concerned. It also confirms that the duty is laid on each of us (to utter God's name) before eating our food and nothing else.
5- God knows that one day slaughter houses will be run by stun guns and machines, which once again emphasises the fact that it is our own responsibility to utter His name on all food before eating it.
Sadly, we see many Muslims today, and because of their obsession with the restriction of slaughtering, buying and eating what they are told is halal meat, yet when they eat other food (e.g. fruit or vegetables) they ignore God's command to utter His name on it. Hence, and since they ignored God's commands and followed man made innovations, they are in fact eating a lot of food that is unlawful according to the Quranic rules.
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This website also acknowledges that many westernised places use the term Halal meat more as a selling point rather than a religious statement.
So its OK for Muslims to eat with us, God allows them to eat non-halal meat as he understands today's society where Muslims are living amongst other Religious people.
Islam seems a nicer way of life on paper, as does Christianity and so on yet they are never fully practised by people, in particular with verses which state to feed/help the poor.