Weekday Mass is different from Sunday Mass. Sunday may not be a holy day for you, but for Christians, we worship on the day of the Resurrection.
A day being holy is established by God, not you or I. So you worshipping on it doesn't make it holy.
As far as your "but for us Christians" remark. I'll let that one go. Last time someone made a similar remark and I called them out on it, I was accused of bearing false witness. I wouldn't want that to happen again.
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