Yes, municipal ordinances are punishable by a fine only, but that doesn't necessarily mean the violator will simply be ticketed. The person violating the ordinance can still be arrested and booked prior to the assessment of a fine.
I appreciate being offered the benefit of your experience, but I don't plan on risking an arrest and a $500 fine on the assumption that every cop in Corpus Christi takes the same relaxed attitude toward knives that you did (particularly when we're talking about switchblades, which have been illegal in Texas since before 99.9% of active police officers were born).
Those ordinances are unenforced or unenforceable. I would not worry about it.