Not your observation, more so the WAY you presented it. For example:
Would have come across better worded something like: "There's actually a little more involved behind the scenes with email servers and cleints, such as..."
^See previous statement. Don't say "I could go into details" and then not elaborate - this comes across as "I'm smarter and better than the rest of you peasants".
Again, not needed and could have been avoided had you just imparted your knowledge in the first place, without being uppity about it.
See my previous post...